“We do work in Syosset, we do work in Jericho, we work in all areas,” said Ross Portnoy of Personal Touch Home Improvement. “We’ve never seen anything like this, except in Plainview and Old Bethpage.”

The Plainview Water District, which provides water to Plainview, Old Bethpage and Syosset, told the I-Team that the "district continually monitors and tests water quality" and that "pinhole leaks can occur in any copper pipe."

They also offer alternative causes besides water quality, including stray electrical currents in the pipes and erosion of the sacrificial anode within the hot water heater.

Pinhole leaks have been studied in several states and published scientific research shows the only time pinhole corrosion has been recreated in the lab is with chlorinated water of high pH and low alkalinity.

It's not clear what's causing the pinhole leaks, but it's leaving residents on edge as they wonder if the problem is coming from their tap.

“If it can go through a copper pipe, what is it doing to me?” asked Burton.